Soak the wood ear mushrooms in hot water until they swell. Rinse them in clean water and finely chop them.
Boil the vermicelli or glass noodles until the fibers soften. Once softened, use scissors to cut the noodles into small pieces.
In a bowl, combine ground pork, noodles, bean sprouts, onions, carrots, green onions, wood ear mushrooms, and 2 egg yolks.
Add 2 tsp of sugar, 1 tsp of salt, and 1 tsp of ground pepper. Mix them well. You can adjust the seasoning to fit your taste. Marinate the mixture for 15 minutes.
Dip rice paper sheets in warm water for about 2-3 seconds. Lay the rice paper on a flat surface. Lay out half of the rice paper sheets (dipped in water) to the first one to prevent tearing.
Place a generous spoonful of the filling on one end. Fold the sides over the filling and roll tightly, similar to a burrito. Repeat this process until all the filling is used.
Heat cooking oil in a deep pan or skillet to 350°F (175°C).
Carefully place the spring rolls into the hot oil and fry until golden brown and crispy. This should take about 3-4 minutes per roll. Remove the rolls and place them on a paper towel to absorb excess oil.
In a bowl, mix fish sauce, sugar, minced garlic, chopped chili (optional), lemon juice, and water. Stir until the sugar dissolves.
Arrange the Nem Ran on a platter with fresh lettuce leaves and a variety of herbs. Dip these golden rolls into the dipping sauce, or drizzle it over the rolls.